Ptolemy XV Philopator Philometor Caesar (Ptolemaios IEʹ Philopatōr Philomētōr Kaisar; ; June 23, 47 BC – August 23, 30 BC), better known by the nicknames Caesarion (; , Kaisariōn, literally "little Caesar"; ) and Ptolemy Caesar (; , Ptolemaios Kaisar; ), was the last king of the Ptolemaic dynasty of Egypt, who reigned jointly with his mother Cleopatra VII of Egypt, from September 2, 47 BC. Between the death of Cleopatra, on August 12, 30 BC, up to his own death on August 23, 30 BC, he was nominally the sole pharaoh. He was killed on the orders of Octavian, who would become the Roman emperor Augustus. He was the eldest son of Cleopatra VII, and possibly the only son of Julius Caesar, after whom he was named.